It's an update full of "grand touring" cars, as the game gets the "GT by Citroen" concept, Ferrari California, and the Lotus Evora for free, as announced on the PlayStation Blog.
The racer has also received a number of gameplay tweaks in the latest evolution of "Prologue," a nearly fully-featured preview version of the racer expected as late as 2010. The update changes the penalty system, tweaks difficulty and winnings in Race events, and improves responsiveness for wireless controllers, among smaller updates.
The progress will come at a price, as "rankings, arcade time trial times, drift trial records, as well as vehicle-specific quick tune settings and custom key layouts will all be reset with the new update." The blog adds that replay data from before the second update will be made unviewable, and users can check their current version number in the in-game manual.